Dow Consolidated Statements of Equity Statement - USD ($) $ in Millions	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Unearned ESOP Shares [Member]	Treasury Stock [Member]
Total equity		$ 0	$ 7,042	$ 35,460	$ (9,885)	$ (134)	$ 0
Stock Issued During Period, Value, New Issues and Treasury Stock Reissued			4
Stock Issued During Period, Value, Parent Company Stock			28
APIC, Share-based Payment Arrangement, Increase for Cost Recognition			202			41
Stockholders' Equity, Other			(37)	(11)
Net Income (Loss) Available to Common Stockholders, Basic				964
Dividends, Common Stock				(1,033)
SEC Schedule, 12-04, Cash Dividends Paid to Registrant, Subsidiaries and Equity Method Investees				(535)
Settlements and transfers related to separation from DowDuPont Inc.	$ (1,935)			(14,861)	(793)
Other Comprehensive Income (Loss), Net of Tax	$ (127)				(127)
Treasury Stock, Value, Acquired, Cost Method							(406)
ESOP shares acquired						(2)
Common Stock, Dividends, Per Share, Declared	$ 1.40
Stockholders' Equity, Period Increase (Decrease) | Adjustments for New Accounting Pronouncement				(111)
Stock Issued During Period, Value, New Issues		7
Total equity		7	7,186	20,110	(8,988)	(99)	(305)
Stock Issued During Period, Value, New Issues and Treasury Stock Reissued			5
Stock Issued During Period, Value, Parent Company Stock			0
APIC, Share-based Payment Arrangement, Increase for Cost Recognition			55			6
Stockholders' Equity, Other			(7)	(4)
Net Income (Loss) Available to Common Stockholders, Basic				333
Dividends, Common Stock				(516)
SEC Schedule, 12-04, Cash Dividends Paid to Registrant, Subsidiaries and Equity Method Investees				0
Settlements and transfers related to separation from DowDuPont Inc.				(50)	0
Other Comprehensive Income (Loss), Net of Tax	$ (231)				(231)
Treasury Stock, Value, Acquired, Cost Method							(101)
ESOP shares acquired						(2)
Common Stock, Dividends, Per Share, Declared	$ 0.70
Stockholders' Equity, Period Increase (Decrease) | Adjustments for New Accounting Pronouncement				0
Stock Issued During Period, Value, New Issues		0
Dow Inc.’s stockholders’ equity	$ 17,399
Noncontrolling interests	587
Total equity	17,986	7	7,239	19,873	(9,219)	(95)	(406)
Dow Inc.’s stockholders’ equity	13,541
Noncontrolling interests	553
Total equity	14,094	8	7,325	17,045	(10,246)	(91)	(500)
Stock Issued During Period, Value, New Issues and Treasury Stock Reissued			53
Stock Issued During Period, Value, Parent Company Stock			0
APIC, Share-based Payment Arrangement, Increase for Cost Recognition			119			34
Stockholders' Equity, Other			0	(10)
Net Income (Loss) Available to Common Stockholders, Basic				(11)
Dividends, Common Stock				(1,552)
SEC Schedule, 12-04, Cash Dividends Paid to Registrant, Subsidiaries and Equity Method Investees				0
Settlements and transfers related to separation from DowDuPont Inc.	0			0	0
Other Comprehensive Income (Loss), Net of Tax	$ 305				305
Treasury Stock, Value, Acquired, Cost Method							(125)
ESOP shares acquired						0
Common Stock, Dividends, Per Share, Declared	$ 2.10
Stockholders' Equity, Period Increase (Decrease) | Adjustments for New Accounting Pronouncement				0
Stock Issued During Period, Value, New Issues		0
Total equity		8	7,431	16,017	(10,225)	(69)	(625)
Stock Issued During Period, Value, New Issues and Treasury Stock Reissued			23
Stock Issued During Period, Value, Parent Company Stock			0
APIC, Share-based Payment Arrangement, Increase for Cost Recognition			43			12
Stockholders' Equity, Other			0	(2)
Net Income (Loss) Available to Common Stockholders, Basic				(25)
Dividends, Common Stock				(518)
SEC Schedule, 12-04, Cash Dividends Paid to Registrant, Subsidiaries and Equity Method Investees				0
Settlements and transfers related to separation from DowDuPont Inc.				0	0
Other Comprehensive Income (Loss), Net of Tax	$ 284				284
Treasury Stock, Value, Acquired, Cost Method							0
ESOP shares acquired						0
Common Stock, Dividends, Per Share, Declared	$ 0.70
Stockholders' Equity, Period Increase (Decrease) | Adjustments for New Accounting Pronouncement				0
Stock Issued During Period, Value, New Issues		0
Dow Inc.’s stockholders’ equity	$ 12,354
Noncontrolling interests	578
Total equity	$ 12,932	$ 8	$ 7,497	$ 15,472	$ (9,941)	$ (57)	$ (625)